Device for straightening metal disks.



0 G RIESKE DEVICE FOR STRAIGHTENING METAL DISKS.

. APPLICATION FILED APR 3, 1908.

Patented May 18, 1909.

lei-ed.

QTTO GEORGE RIESKE, OF

ST. LOUIS PARK, MllNESOl.

EAlG-T-ITENIN .1 TEETAL DEISKS.

Application filed April 3, 1908.

Specification of Letters Patent.

Pa oented Ma 18 1909.

Serial No. 225,075.

To all whom it may concern:

Be it knmvn that I. O'rro GEORGE Elusive, a citizen of the United States. residing at St. Louis Park, in the county oi? l-lennepin and State of Minnesota, huve invented certain new and useful Improvements in Devices for Straightening Metal Disks; and

l do hereby declare the tollowingvto .be :1

:ploiv disks. may be quickly and accurately straightened and at the 831110 time put in such condition that lheye vill not Warp when tenipered.

To the above ends the invention consists of the iwvel devices and comhhnitions of devices hereinafter i'lescribed and defined in the claims.

The accompanying drawings illustrate my improved scrolled disk slrziightene in 21 form which in actual practice has been found highly eilieient tor the purposes hud in view.

In said drawings like characters indicule like. parts throughout the several views.

Figure l is a view chiefly in horizontal :ection but with some parts left in full plan. shoiving the improved device. k farce elevation of a soculled bull spuci g i vice. Fig. 3 is a section token on the line .r'---;c of F .2; and Fig.- i is a :t'ucc view showing in detail it disk which has been or is to be straightened by means of the im proved device.

suid

hence, the face plate 1 is provided with a tapered ilXItl stem 6 and the face plate 2 is provided with a similar tapered axial stem 7 and. in the application or the device to the lathe, the tapered stem 6 is inserted into the socket of the rotary lathe spindle While the tapered stem '2 inserted into the socket of the toil stock of the lathe.

A multiplicity of presser bulls 8 are arranged to roll on the face of the face plate 2 and to hold the some properly spaced and distributed these bulls are seated in pockets 0 formed in u spzicingplate 10. The outer extremities of the pockets 9 are less in diameter than the extreme diameter or the bulls, so that said bzirlls are held against outward displacement, while their outer suriuccs are projected beyond the face'of the said spacing plate 10, and their inner surfaces are projected for engagement with the face oi. the face plate 2. Said spacing plate 10 is made disk-like in form and is provided with a marginal clmnping ring 11, shown secured thereto by screws 12. The face plate 2 is provided with an outwardly projecting marginal flange 13 that is enibruced and held in an annular seat formed by the chnnping ring 11 and marginal portion of the spacing plate 10, so that the latter free to rotate on said ince plu te 2.

The ball containing pockets 9 in the spar ing plate 10 are preferably spirally uranged. so that the axes of the said some are carried successively but very slightly further and further away from the axis of the face plate. This so arranges the preseer bulls thiit iii-their travel on the dish (hulis to be straightened they engage the j entire HUl'l'ZMQ thereot.

The imprlived device. as illustrated in the 1 drawings, C(HHPTISJS a punt oi tucc plates or 1 pluiensl and 9, the opposing faces of which are perfectly lint except that the thee oil the 'l'ucc plate '1 is provided with u central hub 2-) adapted to enter on uxiul perforation l of the disk which is to be straightened and thereby hold the said disk properly cenor struighleniin: iinperl'oru e disks the hub 3 'on the iuce plate 1 would hu'x'c to be eliminated. and other nieuns would be provided for holding the disli centered on eaid face plate. I

The device illustrated in the drawings is designed to be operated by at lathe and,

When the disk 5 is pluccd on the face plate 1 and the prcsser bulls are forced against the face thereof. as shown in Fig. 1, the dish, no matter how crooked, will be quiclv'ly and accurately itruighicncd.by rotation of eitheroi the two hire. plates in respect to the other, or by a reverse or dillerentiel rotation of the two fut-e plates, any of which movements will cause the prcsscr bulls to travel over the face of the disk. in thcprocess ot' straightening the disk, the pressure thereon from the bulls: should be rim-wil increased until the dial; has been completely straightened. This pressure may be produced by an axial movement of either 01" the live face plates in respect to the other;

and. in application to the lui'he, this pres-- l. (l l) minimum.

sure may bereadily produced by axial movement of the tail stock of the lathe, accomplished by means of its usual actuating screw.

Sheet steel, from which saw disks, drill disks and the like are stamped, have a grain extending in one direction; and this produces in the cut disks uneven tension, which, in tempering, warps the disk. in the operation of my improved disk straightening device, the repeated travel of the presser balls over the entire surface of the disk f'while under high pressure, tends to change the grain of the metal of the disk by a stretching thereof circumferentially of the disk. This seems to produce even tension in the cut disk and in practice I have found that a disk thus treated has no tendency to warp when temered. The attainment of this result, aside rom the feature of truing up the disk, is of very great importance in the practical construction of disks'used for the purpose of making circular saws and disks to be used in agricultural machines, such as disk (lflllS, disk cultivators, and disk plows, and, in fact, for making any and all kinds of disks that must be hardened and which must be has only a slight frictional engagement with the ball. Consequently the friction, and

hence the power required to operate the device in straightening disks, is reduced to it Also wear on the parts is reduced to a minimum. The presser balls and the faces of both of the face plates, and especiall of the face plate with which the balls directly engage, should be made very hard, by tempering. V

The device described may, as is evident, be made in any desired size and is capable of large range of modification in its details of construction and arrangement of parts.

In the specification the term presser balls has been used in a broad sense to inball spacing plate 10, that radially adjacent balls in their action on the disk to be straightened and'when under pressure, will form overlapping aths or extremely shallow grooves on the ace of the disk. This causes the balls to en age with the entire surface of'the disk, which is within the zone of action of the innermost and outermost balls. Otherwise stated, the slight annular groove formed by any one presser .ball, will be overlap ed by the grooves formed by prcsser bal s located just inward and just outward thereof, measured in a direct radial of the retaining plate, so that the surface of' the disk acted upon, will, in so far as can be observed by the naked eye, and for practical purposes, be left smooth. At the same time,

all of the disk surface acted upon, will be displaced more or less so that its grain will be stretched in a circumferential direction.

lVhat I claim is:

1. Means for straightening and distorting the grain of sheet metal plates, comprising a face plate against which the sheet metal to be straightened is placed, a multiplicity of presser balls arranged to press said metal plate against said face plate, a nd so closely spaced radially, that radially adjacent balls will form overlapping paths on face of said metal plate, and means for holding said presser balls in the arrangement stated and for causing the same to travel over the face of said metal plate, whereby the said metal plate will be straightened and stretched circumfcrentially and transversely of its natural grain.

2. in a other metal plates, the combination with a pair of face plates, one of which is capable of rotation with respect to the other, of a ball spacing plate rotatably mounted on one of said face plates, a multiplicity of presser balls distributed around the. axis of the rotary face plates and so spaced radially, that the radlally adjacent balls will form overlapping paths 0. said disk, the said spacing plate having ball retaining pockets, the outer extremities of which are of less diameter than the diameter of said balls, and the said balls being held by said spacing plate for rolling engagement with the said face plate to which said space plate is applied, and for rolling engagement with the disk applied to the other face plate.

In testimony whereof I affix my signature in presence of two witnesses.

device for straightening disks and l 

